Improvement in method of attaching rubber to pencils



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JOSEPH RECKENDORFER, OF NEW YORK, N. Y.

Letters Patent No. 85,961, dated January 19, 1869.

To whom it may concern:

and l hereby declare the following to be a full, clear,

and exact description ofthe same. reference being had to theaccompanying drawings, in which- Figure lis a section of a pencil with arubber eraserhead attached, in accordance with my invention.

Figure 2 is a perspective view of the. same, with the rubber headremoved from its socket in the pencil.

The object of my invention is to provide a simple, durable, andefficient means for uniting a rubber eraser with the pencil, pen-holder,or other article, to which it may be applied, which will also serve tostrengthen and stifi'en the rubber; and

My invention may be stated to consist in securing the eraser-head to thearticle with which it is to be combined, by means of a central stern ofmetal, or equivalentw material, Apartly embedded in the rubber head, andprojecting therefrom so as to enter a socket formed for its reception inthe pencil or other article, as hereinafter described.

When this stem is thus arranged, that part of it within the eraser willconstitute a rigid and nnyielding core, to stiien and uphold the rubber,which is thus enabled to resist the pressure to which it is so oftensubjected, while the projecting portion of the stein, which may beeither screw-threaded or plain, when inserted in its socket in thepencil or holder, will hold the eraser securely in place, and willsolidly unite it with the holder.

In the drawings, l have represented the eraser, b, as applied to the endof an ordinary pencil, a.

In this case the greater part of the eraser-head is of the same diameteras the pencil, but its lower end, b', is' somewhat smaller, so as to iitin the countersnnk end, a', of the pencil.

Extending centrally through the eraser-head is a metal stem, c, aroundwhich the rubber is moulded, so that the twc may be permanently united,the stem being roughened, or corrugated, or having a head, as seen iniig. l, in order to allow the rubber to take rm hold.

The stem projects a suitable distance from the base of the eraser, sothat when the pencil and eraser are put together, as in iig. l, the stemwill enter and lit tightly in a corresponding socket, d, formed in thepencil below the countersunk end c., L

This construction of the parts causes the eraser to be held most firmlyand securely, for not only is it held by the stem a, which also stilfensit, but its contracted end, b', acting as a plug, is inserted andcompressed Within the countersunk part a of the pencilend, and thusserves to give it additional strength and stability.

It is obvious, however, that the contracted end b may be dispensed with,the base of the eraser resting directly upon the end ofthe pencil,which, in this case, will be provided with the socket only; and, asrepresented in lig. 2, the stein may be screw-threaded, so as to screwinto its socket, thus preventing all liability of the eraser becomingaccidentally detached from its holder.

Another advantage attending the use of the stem c is, that as it ispermanently united with the rubber, as above described, the lattercannot possibly slip from it, but the two must always remain together.

I am aware that rubber erasers `have been heretofore united with theirholders in various ways, iby making the eraser hollow, so as-to t overthe end oi the holder, or by inserting the-rubber in the'end of theholder. But these methods are open to considerable objection, for, inthe former case, the eraser must necessarily be greater in diameter thanthe pencil, so that when the pencil is withdrawn from the pocket, inwhich it is usually carried, the rubber head will be apt to catch and todraw out with it any papers which may happen to be in the pocket; and,in the latter case, the size of the pencil is increased, rendering itbulky and unsightly, as well as expensive.

My invention obviates all these defects.

As above described, the eraser may be made of the same diameter as theholder. The size of the holder need not be increased, even if the rubbep'befinserted in its end; and, under all circumstances, whether therubber be inserted in the end or not, the eraser, by means of thecentral' stem and core, will be maintained rmly and securely inposition, and united solidly with the holder; therefore,

What I claim as my invention, and desire to secure by Letters Fatent,is-

Uniting the rubber eraser with the pencil or other holder to which it isapplied, by means of a rigid central stem, whether screw-threaded orplain, embedded in and permanently united with therrubber, and extendinginto a socket formed for its reception in the holder, substantially asand for the purposes set forth.

In testimony whereof, I have signed my name to this specification,before two subscribing witnesses.

' JOS. REGKENDORFER.

Witnesses: Y

S. BRAIsTED, SAMUEL P. BELL.

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